One of my favorite sites, $5 Dinners, has a great coupon database. If you’re looking for coupons for specific products, this is a great place to search. I love this site – she always has great, inexpensive recipes to try. I’d highly recommend subscribing to her feed!
Here’s the post about her coupon database: http://www.5dollardinners.com/2010/04/coupon-database.html. Give it a try!